: How does the book define Dumb AI? I thought Smart AI were created from human
: brains. Cortana being the first Smart AI created with a living human
: brain. I would guess that a Dumb AI would be a programmed AI.

This is the paragraph for dumb AIs:

"So-called dumb AIs were enginnered to function only were misleading; within set limits of their dynamic memory-processing matrix. They were brilliant within their fields of expertise, but were lacking in 'creativity'. Deja, for example, was a dumb AI-incredible useful, but lacking."

This explains smart AIs:

"Smart AIs like Cortana, however, had not limits on their dynamic memory-processor matrix. Knowledge and creativity could grow unchecked."

It says that an AIs matrix was created from a human brain. However, it does not say how a smart AI is created differently than a dumb AI.